Question

tell me the answer fast ​

Answer 1

Answer:

7.5

Step-by-step explanation:

perimeter of a equilateral triangle = 10*3=30cm

perimeter of square = perimeter of triangle

side of the square = 30divide 4=7.5

Answer 2

Step-by-step explanation:

)Each side of the Equilateral triangle=10 cm

Perimeter of the equilateral triangle=3×side

=>3×10

=>30 cm

and

If the side of the square is a units then the perimeter of the square=4a units

Given that

Perimeter of the equilateral triangle=Perimeter of the square

=>4a=30

=>a=30/4

=>a=7.5cm

Side of the square=7.5cm

2)Let the breadth be b units

length of the rectangle=(l)=12 cm

Perimeter of the rectangle=2(l+b)

=>2(12+b)=38cm

=>12+b=38/2

=>12+b=19

=>b=19-12

=>b=7cm

Breadth of the rectangle=7cm